Electrochemical impedance spectroscopy characterization of conducting polymer/TiO2 nanotube array hybrid structures

Ngaboyamahina, Edgard; Cachet, H.; Pailleret, Alain; Sutter, Éliane

doi:10.1016/j.jelechem.2014.09.029

Cited by 16 publications

(9 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It appears from Figure that the density of states is higher in aqueous LiClO 4 electrolyte than in a micellar SDBS solution. This is corroborated by electrochemical impedance spectroscopy measurements and Mott–Schottky diagrams . Accordingly TiO 2 NTA in aqueous LiClO 4 solutions has a flat-band potential of −0.45 V/SCE, which is a usual value in aqueous solutions of neutral pH, in the presence of water induced surface states.…”

Section: Resultssupporting

confidence: 59%

“…Accordingly TiO 2 NTA in aqueous LiClO 4 solutions has a flat-band potential of −0.45 V/SCE, which is a usual value in aqueous solutions of neutral pH, in the presence of water induced surface states. In comparison, for the same substrate in SDBS, the flat band potential has been found to be close to 0.1 V/SCE, as a result of the absence of such states, since SDBS adsorption is likely to occur in preference to water. We can thus assume that, during electropolymerization in LiClO 4 electrolytic solution in the dark, the Py monomer can inject electrons into the polarized semiconductor via those surface states, enabling electropolymerization without light excitation, contrary to what is observed in SDBS.…”

Section: Resultsmentioning

confidence: 92%

“…This is corroborated by electrochemical impedance spectroscopy measurements and Mott−Schottky diagrams. 34 Accordingly TiO 2 NTA in aqueous LiClO 4 solutions has a flat-band As it has been done above in a SDBS aqueous electrolyte, attempts to electropolymerize pyrrole by the pulsed-light method have been realized in Py solution containing LiClO 4 . The current baseline in the dark (Figure 5A) increases here significantly.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Electrodeposition of Polypyrrole in TiO₂ Nanotube Arrays by Pulsed-Light and Pulsed-Potential Methods

et al. 2014

Self Cite

View full text Add to dashboard Cite

Using highly ordered TiO 2 nanotube arrays as the substrate for electropolymerization provides a high surface area for polymer deposit and vertical pathways for electron transport. The challenge is to deposit the polymer on the inner and outer walls of the tubes and to avoid the sealing of the tubes at the mouth. Ideally, this situation could be reached by filling the tubes from the bottom. We demonstrate here that by using pulsed methods (light pulses, potential pulses), the deposition rate can be controlled, leading to a better monomer supply within the nanotubular matrix. The parameters to apply for the deposition are greatly dependent on the nature of the anion in the electrolyte, which determines the rate and the location of the polymer growth at the electrolytic solution/semiconductor interface.

show abstract

Section: Resultssupporting

confidence: 59%

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Electrodeposition of Polypyrrole in TiO₂ Nanotube Arrays by Pulsed-Light and Pulsed-Potential Methods

et al. 2014

Self Cite

View full text Add to dashboard Cite

show abstract

“…The EIS measurements of TiO 2 NTA electrodes are conducted for the kinetic analysis of ion diffusion and electron transfer 38–40 . The open‐circuit potential is determined at a current density of 0 according to the linear sweep voltammetry curve of TiO 2 NTA at 5 mV s −1 .…”

Section: Resultsmentioning

confidence: 99%

Photoelectrochemical performance of tubewall‐separated titanium dioxide nanotube array photoelectrode

Xie

2021

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

Titanium dioxide nanotube array (TiO2 NTA) grown on titanium substrate has been fabricated as active photoelectrode for organic compound degradation. TiO2 NTA shows the tubewall‐separated nanotube arrangement and anatase crystal structure. Transient photocurrent of 1.86 mA and open‐circuit photovoltage of 0.26 V are determined to keep stable level under ultraviolet (UV) light irradiation, indicating its high photoelectrochemical activity. The cathodic polarization process causes more feasible electron transfer than the equilibrium process and anodic polarization process, which is consistent with the declining current response at an increasing positive potential. The photocatalytic activity of TiO2 NTA is fully evaluated through UV light‐induced photocatalysis and photoelectrocatalysis degradation of organic dye X‐3B as a reactant pollutant. The pseudo‐first‐order reaction rate constant is enhanced from 0.00346 min−1 for photocatalysis to 0.00521 min−1 for photoelectrocatalysis using Langmuir–Hinshelwood kinetic model of heterogeneous catalysis. The tubewall‐separated nanotube structure could induce photoelectron directional transport and provide extra interspace for reactant organic molecule diffusion at accessible surface area. The positive potential applied on TiO2 NTA could further promote photoelectron–hole pair separation. Two strategies of photoelectron generation and photoelectron–hole separation are accordingly adopted to improve its electro‐assisted photocatalytic activity. Therefore, the tubewall‐separated TiO2 NTA could present the promising photoelectrocatalysis application.

show abstract

“…In addition, electrochemical research methods, including cyclic voltammetry (CV) [ 195 , 196 ], electrochemical impedance spectroscopy (EIS) [ 197 , 198 ] and transient current (TC) [ 199 , 200 ] are commonly used.…”

Section: Methodsmentioning

confidence: 99%

Advances and Prospects in the Study of Spherical Polyelectrolyte Brushes as a Dopant for Conducting Polymers

2024

Molecules

View full text Add to dashboard Cite

Owing to their special structure and excellent physical and chemical properties, conducting polymers have attracted increasing attention in materials science. In recent years, tremendous efforts have been devoted to improving the comprehensive performance of conducting polymers by using the technique of “doping.” Spherical polyelectrolyte brushes (SPBs) bearing polyelectrolyte chains grafted densely to the surface of core particles have the potential to be novel dopant of conducting polymers not only because of their spherical structure, high grafting density and high charge density, but also due to the possibility of their being applied in printed electronics. This review first presents a summary of the general dopants of conducting polymers. Meanwhile, conducting polymers doped with spherical polyelectrolyte brushes (SPBs) is highlighted, including the preparation, characterization, performance and doping mechanism. It is demonstrated that comprehensive performance of conducting polymers has improved with the addition of SPBs, which act as template and dopant in the synthesis of composites. Furthermore, the applications and future developments of conductive composites are also briefly reviewed and proposed, which would draw more attention to this field.

show abstract

Electrochemical impedance spectroscopy characterization of conducting polymer/TiO2 nanotube array hybrid structures

Cited by 16 publications

References 38 publications

Electrodeposition of Polypyrrole in TiO₂ Nanotube Arrays by Pulsed-Light and Pulsed-Potential Methods

Electrodeposition of Polypyrrole in TiO₂ Nanotube Arrays by Pulsed-Light and Pulsed-Potential Methods

Photoelectrochemical performance of tubewall‐separated titanium dioxide nanotube array photoelectrode

Advances and Prospects in the Study of Spherical Polyelectrolyte Brushes as a Dopant for Conducting Polymers

Contact Info

Product

Resources

About

Electrochemical impedance spectroscopy characterization of conducting polymer/TiO2 nanotube array hybrid structures

Cited by 16 publications

References 38 publications

Electrodeposition of Polypyrrole in TiO2 Nanotube Arrays by Pulsed-Light and Pulsed-Potential Methods

Electrodeposition of Polypyrrole in TiO2 Nanotube Arrays by Pulsed-Light and Pulsed-Potential Methods

Photoelectrochemical performance of tubewall‐separated titanium dioxide nanotube array photoelectrode

Advances and Prospects in the Study of Spherical Polyelectrolyte Brushes as a Dopant for Conducting Polymers

Contact Info

Product

Resources

About

Electrodeposition of Polypyrrole in TiO₂ Nanotube Arrays by Pulsed-Light and Pulsed-Potential Methods

Electrodeposition of Polypyrrole in TiO₂ Nanotube Arrays by Pulsed-Light and Pulsed-Potential Methods